Boy Mow Chau's answer to mint's Junior College 2 H2 Maths Singapore question.
done
{{ upvoteCount }} Upvotes
clear
{{ downvoteCount * -1 }} Downvotes
for the probability, easier to calculate as ...
no. of ways of selecting x red counters and (4-x) blue counters, divide by total ways of selecting 4 counters
for the expectation, by definition ...
expectation of X = sum of all [ x multiply P(X=x) ]
no. of ways of selecting x red counters and (4-x) blue counters, divide by total ways of selecting 4 counters
for the expectation, by definition ...
expectation of X = sum of all [ x multiply P(X=x) ]
Date Posted:
3 years ago
360 Tutoring Program